Is there a public exploit for CVE-2026-127203?

No public exploit for CVE-2026-127203 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-127203?

CVE-2026-127203 scores CVSS 5.1 (v4.0), rated medium.

What does CVE-2026-127203 affect?

CVE-2026-127203 affects AppFlowy-IO AppFlowy-Cloud.

5.1 Medium

AppFlowy Cloud through 0.9.64 contains a stored cross-site scripting vulnerability that allows authenticated workspace members to upload…

CVE-2026-127203

AppFlowy Cloud through 0.9.64 contains a stored cross-site scripting vulnerability that allows authenticated workspace members to upload blobs with unvalidated Content-Type values that are later served inline without a Content-Disposition header or authentication on the retrieval route. Attackers can upload a text/html or image/svg+xml blob via putblobhandler, which is then rendered as an active same-origin document through the unauthenticated getblobhandler endpoint and cached immutably for one year, enabling persistent script execution against any visitor who accesses the URL.

Assessment

CVSS: 5.1 (v4.0)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 12 November 2026
Last updated: 12 November 2026
Affected: AppFlowy-IO · AppFlowy-Cloud
Assigner: VulnCheck

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

At the source

EUVD (ENISA)

References

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