CVE-2022-38972 — Cross-site scripting vulnerability in Movable Type plugin A-Form versions prior

Cross-site scripting vulnerability in Movable Type plugin A-Form versions prior to 4.1.1 (for Movable Type 7 Series) and versions prior to 3.9.1 (for Movable Type 6 Series) allows a remote unauthenticated attacker to inject an arbitrary script.

01What is this vulnerability?

Cross-site scripting vulnerability in Movable Type plugin A-Form versions prior to 4.1.1 (for Movable Type 7 Series) and versions prior to 3.9.1 (for Movable Type 6 Series) allows a remote unauthenticated attacker to inject an arbitrary script.

02Affected products

Vendor	Product	Versions
ARK-Web co., ltd.	A	Form — versions prior to 4.1.1 (for Movable Type 7 Series) and versions prior to 3.9.1 (for Movable Type 6 Series)

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-09-12T01:50:14.000Z
• Last modified: 2024-08-03T11:10:31.617Z

09References

• www.ark-web.jp — https://www.ark-web.jp/blog/archives/2022/09/a-series-411-391.html
• www.ark-web.jp — https://www.ark-web.jp/movabletype/blog/2022/09/a-series-411-391.html
• jvn.jp — https://jvn.jp/en/jp/JVN48120704/index.html