Security readout for executives and security teams
Plain-English summary
This vulnerability affects WeKan attachment uploads before version 8.19. A logged-in user may be able to submit inconsistent board, card, swimlane, or list identifiers and attach content where the relationships should not be allowed. The main business risk is unauthorized modification of project records, not system takeover.
Executive priority
Prioritize remediation for shared, internet-accessible, or customer-facing WeKan systems. This is a high integrity issue, but available sources do not support active exploitation or emergency treatment.
Technical view
The attachment upload API lacks complete authorization validation across related object IDs. CVSS 4.0 rates this 7.1 with network access, low privileges, no user interaction, and high integrity impact. The public description identifies CWE-863 and WeKan versions prior to 8.19.
Likely exposure
Organizations running WeKan before 8.19 are the likely exposure group, especially multi-user instances where authenticated users can upload attachments. The source bundle does not provide enough detail to confirm specific deployment modes or CPE coverage.
Exploitation context
The source bundle says this is not in KEV and provides no cited evidence of active exploitation. The risk is plausible because exploitation requires only a valid low-privilege account and network access to the upload API.
Researcher notes
There is some metadata ambiguity: the affected array is sparse, while the title and description state versions prior to 8.19. Validate exposure against WeKan release data and the linked patch before closing findings.
Mitigation direction
- Inventory WeKan deployments and confirm running versions.
- Upgrade affected WeKan instances to 8.19 or later.
- Review the referenced patch commit against deployed code.
- Check WeKan vendor guidance for any additional hardening steps.
- Monitor attachment activity for unexpected board or card relationships.
Validation and detection
- Confirm each WeKan instance reports version 8.19 or later.
- Verify the attachment upload validation patch is present.
- Review logs for suspicious attachment uploads by low-privilege users.
- Confirm users cannot attach files across unrelated board or card relationships.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-863: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-25561 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
7.1HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/wekan/wekan/commit/1d16955b6d4f0a0282e89c2c1b0415c7597019b8CVE reference, VulnCheck · patch
- https://wekan.fi/CVE reference, VulnCheck · product
- https://www.vulncheck.com/advisories/wekan-attachment-upload-object-relationship-validation-bypassCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Incorrect Authorization
Incorrect Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.