Foswiki up to 2.1.10 Changes/Viewfile/Oops information disclosure

Summaryinfo

A vulnerability classified as problematic has been found in Foswiki up to 2.1.10. The impacted element is an unknown function of the component Changes/Viewfile/Oops. This manipulation causes information disclosure. This vulnerability is handled as CVE-2026-2861. The attack can be initiated remotely. Additionally, an exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Foswiki up to 2.1.10. It has been declared as problematic. Affected by this vulnerability is some unknown processing of the component Changes/Viewfile/Oops. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality.

The weakness was released by Jan Seebens and Michael Daum as 15600/15601/15602 as confirmed task (Website). The advisory is shared at foswiki.org. The public release was coordinated with the project team. This vulnerability is known as CVE-2026-2861. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

It is declared as proof-of-concept.

Upgrading to version 2.1.11 eliminates this vulnerability. Applying the patch 31aeecb58b64/d8ed86b10e46 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.0

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Foswiki 2.1.11
Patch: 31aeecb58b64/d8ed86b10e46

Timelineinfo

02/20/2026 Advisory disclosed
02/20/2026 +0 days VulDB entry created
02/27/2026 +7 days VulDB entry last update

Sourcesinfo

Advisory: 15600/15601/15602
Researcher: Jan Seebens, Michael Daum
Status: Confirmed
Confirmation: 🔒
Coordinated: 🔒

CVE: CVE-2026-2861 (🔒)
GCVE (CVE): GCVE-0-2026-2861
GCVE (VulDB): GCVE-100-347101
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 02/20/2026 15:12
Updated: 02/27/2026 13:50
Changes: 02/20/2026 15:12 (58), 02/20/2026 15:13 (1), 02/20/2026 15:26 (4), 02/22/2026 22:50 (31), 02/27/2026 13:50 (1)
Complete: 🔍
Submitter: Michael Daum
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #753966: Foswiki 2.1.10 and before Information Disclosure (by Michael Daum)

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