CVE-2021-25983: In Factor (App Framework & Headless CMS) forum plugin, versions v1.3.8 to v1.8.30, are vulnerable to reflected

Q: How do I fix CVE-2021-25983?

factor: upgrade to newer than 1.8.30. Exact commands for each OS are on this page.

Q: Is CVE-2021-25983 being exploited?

CVE-2021-25983 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-25983 affect?

CVE-2021-25983 affects factor. Severity is medium (CVSS 6.1). In Factor (App Framework & Headless CMS) forum plugin, versions v1.3.8 to v1.8.30, are vulnerable to reflected Cross-Site Scripting (XSS) at the “tags” and “category” parameters in the URL. An unauthenticated attacker can execute malicious

Q: How urgent is CVE-2021-25983?

Priority 35/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2021-25983 is a medium-severity flaw (CVSS 6.1) affecting factor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Factor (App Framework & Headless CMS) forum plugin, versions v1.3.8 to v1.8.30, are vulnerable to reflected Cross-Site Scripting (XSS) at the “tags” and “category” parameters in the URL. An unauthenticated attacker can execute malicious JavaScript code and steal the session cookies.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-11-16
Last modified	2026-06-17

Publisher (CNA): Mend · Vendor: darwin

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-11-16 10:15 UTCPublished CVE record published
2026-06-17 03:42 UTCUpdated Record last modified

darwin factor UPGRADE

Affected: >= 1.3.8 and <= 1.8.30

Fixed in: newer than 1.8.30

Safe to downgrade to: a release before 1.3.8

1. Check installed version

npm ls factor

2. UPGRADE to newer than 1.8.30

npm install factor@">1.8.30"

3. If no update is available yet, DOWNGRADE to a release before 1.3.8

npm view factor versions npm install factor@"<1.3.8"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-25983?

factor: upgrade to newer than 1.8.30. Exact commands for each OS are on this page.

Is CVE-2021-25983 being exploited?

CVE-2021-25983 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-25983 affect?

CVE-2021-25983 affects factor. Severity is medium (CVSS 6.1). In Factor (App Framework & Headless CMS) forum plugin, versions v1.3.8 to v1.8.30, are vulnerable to reflected Cross-Site Scripting (XSS) at the “tags” and “category” parameters in the URL. An unauthenticated attacker can execute malicious

How urgent is CVE-2021-25983?

Priority 35/100. No elevated risk signals yet.

Related CVEs

CVE-2021-25985 HIGH 7.8 UPGRADE In Factor (App Framework & Headless CMS) v1.0.4 to v1.8.30, improperly invalidate a user’s session even after
CVE-2021-25984 MEDIUM 6.1 UPGRADE In Factor (App Framework & Headless CMS) forum plugin, versions v1.3.3 to v1.8.30, are vulnerable to stored Cr
CVE-2021-25982 MEDIUM 6.1 UPGRADE In Factor (App Framework & Headless CMS) forum plugin, versions 1.3.5 to 1.8.30, are vulnerable to reflected C

References

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