140 lines
6.0 KiB
JSON
140 lines
6.0 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-52767",
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"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"state": "PUBLISHED",
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"assignerShortName": "GitHub_M",
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"dateReserved": "2026-06-08T17:13:43.064Z",
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"datePublished": "2026-09-04T23:40:39.725Z",
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"dateUpdated": "2026-09-08T18:02:12.443Z"
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},
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"containers": {
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"cna": {
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"title": "YesWiki: Unauthenticated ActivityPub Signature-Verification Bypass via `!openssl_verify(...)` accepting `int(-1)`",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-347",
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"lang": "en",
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"description": "CWE-347: Improper Verification of Cryptographic Signature",
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"type": "CWE"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"attackComplexity": "LOW",
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"attackVector": "NETWORK",
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"availabilityImpact": "LOW",
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"baseScore": 8.2,
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"baseSeverity": "HIGH",
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"confidentialityImpact": "NONE",
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"integrityImpact": "HIGH",
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"privilegesRequired": "NONE",
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"scope": "UNCHANGED",
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"userInteraction": "NONE",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L",
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"version": "3.1"
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}
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}
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],
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"references": [
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{
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"name": "https://github.com/YesWiki/yeswiki/security/advisories/GHSA-mv28-wj57-f57g",
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"tags": [
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"x_refsource_CONFIRM"
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],
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"url": "https://github.com/YesWiki/yeswiki/security/advisories/GHSA-mv28-wj57-f57g"
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},
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{
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"name": "https://github.com/YesWiki/yeswiki/commit/d1795e0301e1a1078f17b4b98f56fff70de2029e",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/YesWiki/yeswiki/commit/d1795e0301e1a1078f17b4b98f56fff70de2029e"
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},
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{
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"name": "https://github.com/YesWiki/yeswiki/releases/tag/v4.6.6",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/YesWiki/yeswiki/releases/tag/v4.6.6"
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}
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],
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"affected": [
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{
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"vendor": "YesWiki",
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"product": "yeswiki",
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"versions": [
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{
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"version": ">= 4.6.2, < 4.6.6",
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"status": "affected"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"shortName": "GitHub_M",
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"dateUpdated": "2026-09-04T23:40:39.725Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "YesWiki is a wiki system written in PHP. From version 4.6.2 to before version 4.6.6, HttpSignatureService::verifySignature() checks the result of PHP's openssl_verify() with a loose boolean negation - if (!openssl_verify(...)) { throw ... }. PHP's openssl_verify has four possible return values: 1, 0, -1, and \"false\". The -1 row is the bypass: PHP's truthiness rules make -1 a truthy value, so !(-1) === false, the throw is skipped, and the controller proceeds to processActivity(). Any condition that makes OpenSSL's EVP_VerifyFinal() return -1 triggers the bypass. The reachable consequence is the controller silently treats a failed verification as success and processes the attacker's payload. This issue has been patched in version 4.6.6."
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}
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],
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"source": {
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"advisory": "GHSA-mv28-wj57-f57g",
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"discovery": "UNKNOWN"
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}
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/YesWiki/yeswiki/security/advisories/GHSA-mv28-wj57-f57g",
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"tags": [
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"exploit"
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]
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}
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],
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-09-08T17:51:20.326023Z",
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"id": "CVE-2026-52767",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-09-08T18:02:12.443Z"
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}
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}
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]
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}
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} |