OpenOlat up to 20.2.4 JWKS Endpoint JSONWebToken.parse improper authentication

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.4$0-$5k1.28

Summaryinfo

A vulnerability marked as critical has been reported in OpenOlat up to 20.2.4. Affected by this issue is the function JSONWebToken.parse of the component JWKS Endpoint. Performing a manipulation results in improper authentication. This vulnerability is reported as CVE-2026-31946. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in OpenOlat up to 20.2.4. This affects the function JSONWebToken.parse of the component JWKS Endpoint. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

OpenOlat is an open source web-based e-learning platform for teaching, learning, assessment and communication. From version 10.5.4 to before version 20.2.5, OpenOLAT's OpenID Connect implicit flow implementation does not verify JWT signatures. The JSONWebToken.parse() method silently discards the signature segment of the compact JWT (header.payload.signature), and the getAccessToken() methods in both OpenIdConnectApi and OpenIdConnectFullConfigurableApi only validate claim-level fields (issuer, audience, state, nonce) without any cryptographic signature verification against the Identity Provider's JWKS endpoint. This issue has been patched in version 20.2.5.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-31946 since 03/10/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 20.2.5 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector (GitHub_M): 🔒

CVSSv2info

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

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: OpenOlat 20.2.5

Timelineinfo

03/10/2026 CVE reserved
03/30/2026 +20 days VulDB entry created
03/31/2026 +0 days Advisory disclosed
03/31/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-v8vp-x4q4-2vch
Status: Confirmed

CVE: CVE-2026-31946 (🔒)
GCVE (CVE): GCVE-0-2026-31946
GCVE (VulDB): GCVE-100-354267

Entryinfo

Created: 03/31/2026 00:17
Changes: 03/31/2026 00:17 (65)
Complete: 🔍
Cache ID: 216:15C:103

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