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CVE-2026-26078

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, when the `patreon_webhook_secret` site setting is blank, an attacker can forge valid webhook signatures by computing an HMAC-MD5 with an empty string as the key. Since the request body is known to the sender, the attacker can produce a matching signature and send arbitrary webhook payloads. This allows unauthorized creation, modification, or deletion of Patreon pledge data and triggering patron-
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:484d581c70dcb7ce1f67ae94f66f7e6b75adea9c20253404403d751462d21e22
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"discourse","vendor":"discourse","versions":[{"status":"affected","version":"< 2025.12.2"},{"status":"affected","version":">= 2026.1.0-latest, < 2026.1.1"},{"status":"affected","version":">= 2026.2.0-latest, < 2026.2.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bb90cbc2465182db09b3d326f15af3b5342836b3841b6dae5429764fe2ace622 · sha256:c3e83c42b7066422… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bb90cbc2465182db09b3d326f15af3b5342836b3841b6dae5429764fe2ace622 · sha256:c3e83c42b7066422… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-639","description":"CWE-639: Authorization Bypass Through User-Controlled Key","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bb90cbc2465182db09b3d326f15af3b5342836b3841b6dae5429764fe2ace622 · sha256:c3e83c42b7066422… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/discourse/discourse/security/advisories/GHSA-frx4-wg35-4r68","tags":["x_refsource_CONFIRM"],"url":"https://github.com/discourse/discourse/security/advisories/GHSA-frx4-wg35-4r68"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bb90cbc2465182db09b3d326f15af3b5342836b3841b6dae5429764fe2ace622 · sha256:c3e83c42b7066422… · /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.

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