Security readout for executives and security teams
Plain-English summary
FactorJS Factor forum pages may store unsafe reply content, letting an unauthenticated attacker run JavaScript in another user's browser when they view the reply. Business impact is account compromise risk, especially if administrator or authenticated-user sessions are exposed.
Executive priority
Treat as a moderate web application risk. Prioritize internet-facing community or support forums, especially where administrators browse user-submitted replies while logged in.
Technical view
CVE-2021-25984 is stored XSS in the Factor forum plugin post reply functionality, reported for versions v1.3.3 through v1.8.30. CVSS 3.1 is 6.1: network exploitable, low complexity, no privileges, user interaction required, changed scope, low confidentiality and integrity impact.
Likely exposure
Exposure is most likely where FactorJS Factor uses the forum plugin with public or unauthenticated reply posting enabled, particularly on internet-facing sites running v1.3.3 through v1.8.30.
Exploitation context
The source bundle says an unauthenticated attacker can execute malicious JavaScript and steal session cookies. It does not show KEV listing or other evidence of active exploitation in the wild.
Researcher notes
Evidence identifies the vulnerable component and affected range, but the bundle does not name a fix version, patch commit, or active exploitation. Validation should stay non-destructive and focus on version exposure, forum configuration, and safe rendering behavior.
Mitigation direction
- Check FactorJS vendor guidance for fixed or unaffected versions.
- Upgrade away from affected Factor forum plugin versions when vendor guidance identifies a fix.
- Disable or restrict unauthenticated forum replies until remediation is complete.
- Ensure reply content is sanitized and safely rendered before storage and display.
- Use HttpOnly, Secure, and SameSite cookie settings to reduce session theft impact.
Validation and detection
- Inventory FactorJS Factor deployments and forum plugin usage.
- Confirm whether deployed versions fall between v1.3.3 and v1.8.30.
- Verify public reply posting is disabled, authenticated, or protected by server-side sanitization.
- Review stored forum replies for suspicious script-like content.
- Confirm session cookies use defensive attributes where supported.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2021-25984 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
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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.
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:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/FactorJS/factor/blob/v1.8.30/%40plugins/plugin-forum/topic-reply.vue#L119CVE reference · x_refsource_MISC
- https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25984CVE reference · x_refsource_MISC
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.