CVE-2026-67351

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (44th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
8.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 8.8Exploit: Elevated riskExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

Serendipity before 2.6.1 contains an authentication context confusion vulnerability where password validation and session loading operate independently without ensuring both use the same user record. An authenticated Editor can create a username collision with an Administrator account and obtain administrative privileges by logging in with their own password while the session loads the Administrator's account data.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
56
EG Risk 56/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.6%
EPSS %ILE
44th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 30, 2026

Last Modified

July 31, 2026

Advisory Details (2)

Auto-updated Jul 30, 2026
🔬 Proof of concept available. No fix on record yet. Sources: github.
generic

Serendipity < 2.6.1 Authentication Bypass via Username Collision | Advisories | VulnCheck

https://www.vulncheck.com/advisories/serendipity-authentication-bypass-via-username-collision
githubMentions a patch (unverified)🟡 PoC Available

Authentication Context Confusion: Editor Escalates to Admin via Username Collision · Advisory · s9y/Serendipity · GitHub

https://github.com/s9y/Serendipity/security/advisories/GHSA-v645-243f-jwgh

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 118 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 23:53 UTCEG score recompute
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  24. 2026-09-23 17:54 UTCEPSS rescore
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  1. 2026-09-22 15:15 UTCEG score recompute
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  3. 2026-09-20 20:16 UTCEPSS rescore
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  18. 2026-09-10 19:07 UTCEG score recompute
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  26. 2026-09-05 15:31 UTCEPSS rescore
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  40. 2026-08-27 20:48 UTCEG score recompute
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  42. 2026-08-26 14:47 UTCEPSS rescore
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  44. 2026-08-25 13:49 UTCEPSS rescore
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  48. 2026-08-23 00:19 UTCEPSS rescore
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  50. 2026-08-21 23:49 UTCEPSS rescore
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  52. 2026-08-20 22:56 UTCEPSS rescore
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  54. 2026-08-19 17:04 UTCEPSS rescore
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  60. 2026-08-16 14:56 UTCEPSS rescore
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  67. 2026-08-12 13:51 UTCEPSS rescore
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  70. 2026-08-11 00:00 UTCEPSS rescore
  71. 2026-08-09 15:48 UTCEG score recompute
  72. 2026-08-09 13:47 UTCEPSS rescore
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  74. 2026-08-08 16:37 UTCEPSS rescore
  75. 2026-08-08 00:48 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-67351?
CVE-2026-67351 is a high vulnerability published on July 30, 2026. Serendipity before 2.6.1 contains an authentication context confusion vulnerability where password validation and session loading operate independently without ensuring both use the same user record. An authenticated Editor can create a username collision with an Administrator account and obtain…
When was CVE-2026-67351 disclosed?
CVE-2026-67351 was first published on July 30, 2026, with the most recent update on July 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-67351 actively exploited?
CVE-2026-67351 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-67351?
CVE-2026-67351 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-67351?
No fix for CVE-2026-67351 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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