CVE-2026-126771

MEDIUM 5.4

OpsTree REMS through 1.0.0 Stored XSS via Attachment Upload and Preview

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

OpsTree REMS through 1.0.0 contains a stored cross-site scripting vulnerability that allows authenticated attackers to inject scripts by uploading attachments with spoofed text/html Content-Type. Attackers can upload HTML files named like test.html.pdf that render in the REMS origin via Preview, executing JavaScript in victims' browsers.

CWE	CWE-79
Vendor	opstree solutions
Product	rems
Published	Nov 11, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

OpsTree Solutions / REMS

0 ≤ 1.0.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

gist.github.com: https://gist.github.com/neelkotnis/ddf75e2cb7192180e6c9618d27d1e99b opstree.com: https://opstree.com/rems-ai-powered-observability/ vulncheck.com: https://www.vulncheck.com/advisories/opstree-rems-through-1.0.0-stored-xss-via-attachment-upload-and-preview

Credits

Neel Saurabh Kotnis