OpenFUN Richie api.py sync_course_run_from_request signature verification

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.9$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in OpenFUN Richie. This affects the function sync_course_run_from_request of the file src/richie/apps/courses/api.py. Performing a manipulation results in signature verification. This vulnerability is reported as CVE-2026-26717. The attack is possible to be carried out remotely. No exploit exists. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability, which was classified as problematic, was found in OpenFUN Richie (affected version unknown). This affects the function sync_course_run_from_request of the file src/richie/apps/courses/api.py. The manipulation with an unknown input leads to a signature verification vulnerability. CWE is classifying the issue as CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. This is going to have an impact on integrity. The summary by CVE is:

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

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-26717 since 02/16/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available.

Applying the patch a1b5bbda3403d7debb466c303a32852925fcba5f is able to eliminate this problem. The bugfix is ready for download at github.com.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.9
VulDB Meta Temp Score: 3.9

VulDB Base Score: 3.1
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 4.8
ADP CISA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Signature verification
CWE: CWE-347 / CWE-345
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: a1b5bbda3403d7debb466c303a32852925fcba5f

Timelineinfo

02/16/2026 CVE reserved
02/25/2026 +9 days Advisory disclosed
02/25/2026 +0 days VulDB entry created
02/28/2026 +3 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: a1b5bbda3403d7debb466c303a32852925fcba5f
Status: Confirmed

CVE: CVE-2026-26717 (🔒)
GCVE (CVE): GCVE-0-2026-26717
GCVE (VulDB): GCVE-100-347817

Entryinfo

Created: 02/25/2026 18:32
Updated: 02/28/2026 21:38
Changes: 02/25/2026 18:32 (56), 02/28/2026 21:38 (11)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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