CVE-2026-126771
OpsTree REMS through 1.0.0 Stored XSS via Attachment Upload and Preview
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| REMS OpsTree Solutions |
≥ 0; ≤ 1.0.0 (affected, custom)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 5.1 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N | CNA: VulnCheck |
| 3.1 / 5.4 medium |
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N | CNA: VulnCheck |
Exploit evidence
- https://gist.github.com/neelkotnis/ddf75e2cb7192180e6c9618d27d1e99b
exploit · CNA: VulnCheck
References
- https://gist.github.com/neelkotnis/ddf75e2cb7192180e6c9618d27d1e99bCNA: VulnCheck · technical-description, exploit
- https://opstree.com/rems-ai-powered-observability/CNA: VulnCheck · product
- https://www.vulncheck.com/advisories/opstree-rems-through-1.0.0-stored-xss-via-attachment-upload-and-previewCNA: VulnCheck · third-party-advisory
For agents and automation
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