OpsTree REMS through 1.0.0 contains a stored cross-site scripting vulnerability that allows authenticated attackers to
Source GCVE Database
Not known to be exploited · CVSS 5.1 Medium.
Data as of 11 Nov 2026, 22:34 UTC
Thin evidence
One scorer or none| CNA (VulnCheck) | CVSS 4.0 | 5.1 |
|---|---|---|
| CNA (VulnCheck) | CVSS 3.1 | 5.4 |
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 11 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| OpsTree SolutionsREMS | Affected
| Fixed in– |
GitHubopstree/remspkg:github/opstree/remsOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Since the vulnerability requires authenticated access and user interaction, restricting attachment types or disabling preview functionality for untrusted content may reduce risk. Monitor the vendor advisory for updates and apply any forthcoming patches promptly. Until a fix is available, exercise caution when handling attachments and educate users about the risk of previewing suspicious files.
Description
OpsTree REMS versions through 1.0.0 have a stored cross-site scripting (XSS) vulnerability. Authenticated attackers can exploit this by uploading attachments with a spoofed text/html Content-Type, such as HTML files disguised with double extensions (e.g., test.html.pdf). When these files are previewed in the REMS application, the embedded JavaScript executes in the context of the victim's browser.
References
- nvd.nist.gov/vuln/detail/CVE-2026-126771 (opens in a new tab)
- gist.github.com/neelkotnis/ddf75e2cb7192180e6c9618d27d1e99b (opens in a new tab)
- opstree.com/rems-ai-powered-observability (opens in a new tab)
- vulncheck.com/advisories/opstree-rems-through-1.0.0-stored-xss-via-attachment-upload-and-preview (opens in a new tab)