Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-39963

Serendipity is a PHP-powered weblog engine. In versions 2.6-beta2 and below, the serendipity_setCookie() function in include/functions_config.inc.php uses $_SERVER['HTTP_HOST'] without validation as the domain parameter of setcookie(). An attacker who can influence the Host header at login time, such as via MITM, reverse proxy misconfiguration, or load balancer manipulation, can force authentication cookies including session tokens and auto-login tokens to be scoped to an attacker-controlled do
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f342fcef47b1270d163e9b183df5fd3e318686ecd81f49407c5dc9f25db65d16
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"Serendipity","vendor":"s9y","versions":[{"status":"affected","version":"< 2.6.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d82c9533b37bf87e1a5d079a6d7f102cef866621a56c93506035b1cef05abb16 · sha256:492072f877b095a1… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d82c9533b37bf87e1a5d079a6d7f102cef866621a56c93506035b1cef05abb16 · sha256:492072f877b095a1… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-565","description":"CWE-565: Reliance on Cookies without Validation and Integrity Checking","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d82c9533b37bf87e1a5d079a6d7f102cef866621a56c93506035b1cef05abb16 · sha256:492072f877b095a1… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/s9y/Serendipity/releases/tag/2.6.0","tags":["x_refsource_MISC"],"url":"https://github.com/s9y/Serendipity/releases/tag/2.6.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d82c9533b37bf87e1a5d079a6d7f102cef866621a56c93506035b1cef05abb16 · sha256:492072f877b095a1… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/s9y/Serendipity/security/advisories/GHSA-4m6c-649p-f6gf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d82c9533b37bf87e1a5d079a6d7f102cef866621a56c93506035b1cef05abb16 · sha256:492072f877b095a1… · /containers/adp/0/references/0
{"name":"https://github.com/s9y/Serendipity/security/advisories/GHSA-4m6c-649p-f6gf","tags":["x_refsource_CONFIRM"],"url":"https://github.com/s9y/Serendipity/security/advisories/GHSA-4m6c-649p-f6gf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d82c9533b37bf87e1a5d079a6d7f102cef866621a56c93506035b1cef05abb16 · sha256:492072f877b095a1… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

← Back to CVE Explorer