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CVE-2026-26717

An issue in OpenFUN Richie (LMS) in src/richie/apps/courses/api.py. The application used the non-constant time == operator for HMAC signature verification in the sync_course_run_from_request function. This allows remote attackers to forge valid signatures and bypass authentication by measuring response time discrepancies
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c449dfc0eb70b4ee3897804c3d12060518bd599e59b67749148f6bf5e1b0b5c8
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-208","description":"CWE-208 Observable Timing Discrepancy","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:125e08ccf1c0b925859ff0bb738eab031d40338f16c30b0f082333dfadf2131d · sha256:73dcd7a4002fd5cb… · /containers/adp/0/problemTypes/0/descriptions/0

{"description":"n/a","lang":"en","type":"text"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:125e08ccf1c0b925859ff0bb738eab031d40338f16c30b0f082333dfadf2131d · sha256:73dcd7a4002fd5cb… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:125e08ccf1c0b925859ff0bb738eab031d40338f16c30b0f082333dfadf2131d · sha256:73dcd7a4002fd5cb… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.8,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:125e08ccf1c0b925859ff0bb738eab031d40338f16c30b0f082333dfadf2131d · sha256:73dcd7a4002fd5cb… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-208","description":"CWE-208 Observable Timing Discrepancy","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:125e08ccf1c0b925859ff0bb738eab031d40338f16c30b0f082333dfadf2131d · sha256:73dcd7a4002fd5cb… · /containers/adp/0/problemTypes/0/descriptions/0
{"description":"n/a","lang":"en","type":"text"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:125e08ccf1c0b925859ff0bb738eab031d40338f16c30b0f082333dfadf2131d · sha256:73dcd7a4002fd5cb… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"url":"https://github.com/Rickidevs/CVE-2026-26717"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:125e08ccf1c0b925859ff0bb738eab031d40338f16c30b0f082333dfadf2131d · sha256:73dcd7a4002fd5cb… · /containers/cna/references/1
{"url":"https://github.com/openfun/richie/commit/a1b5bbda3403d7debb466c303a32852925fcba5f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:125e08ccf1c0b925859ff0bb738eab031d40338f16c30b0f082333dfadf2131d · sha256:73dcd7a4002fd5cb… · /containers/cna/references/0
{"url":"https://medium.com/@ordogh/cve-2026-26717-hmac-timing-attack-in-openfun-richie-lms-f04377efe83d?postPublishedType=repub"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:125e08ccf1c0b925859ff0bb738eab031d40338f16c30b0f082333dfadf2131d · sha256:73dcd7a4002fd5cb… · /containers/cna/references/2

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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