OpenMage magento-lts before 20.18.2 and 21.0.0-beta1 before 21.0.0-beta3 contains a stored cross-site scripting
Source GCVE Database
Not known to be exploited · CVSS 8.4 High : upgrade to 20.18.2 soon.
Data as of 13 Nov 2026, 13:47 UTC
Thin evidence
One scorer or none| CNA (VulnCheck) | CVSS 4.0 | 8.4 |
|---|---|---|
| CNA (VulnCheck) | CVSS 3.1 | 6.1 |
- Patch
- Available – fixed in 20.18.2, 21.0.0-beta3
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 13 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 13 Nov 2026.
What to do
Upgrade magento-lts to 20.18.2; magento-lts to 21.0.0-beta3; openmage/magento-lts to 21.0.0-beta3 or 20.18.2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| OpenMagemagento-lts | Affected
| Fixed in
|
| OpenMagemagento-lts | Affected
| Fixed in
|
GitHubopenmage/magento-ltspkg:github/openmage/magento-ltsOther 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
If you cannot patch yet, restrict administrative access to trusted users only and avoid opening suspicious admin pages.
Description
OpenMage magento-lts versions before 20.18.2 and 21.0.0-beta1 before 21.0.0-beta3 contain a stored cross-site scripting (XSS) vulnerability. This occurs because certain admin page variables are rendered without proper escaping, allowing an attacker with limited admin access to inject malicious scripts. These scripts execute when another administrator accesses the affected pages, potentially allowing theft of form keys and unauthorized actions with that administrator's privileges.
References
- github.com/OpenMage/magento-lts/security/advisories/GHSA-m858-x59w-rmp5 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-128040 (opens in a new tab)
- github.com/OpenMage/magento-lts/commit/62d2885fa6e7a4454e3a5c7765a6a5ca0085ecc1 (opens in a new tab)
- github.com/OpenMage/magento-lts/commit/7f7a9deaac11fd2437bb1f8065db152a4b620609 (opens in a new tab)
- github.com/OpenMage/magento-lts/commit/d10314ddda9a6081bc27370b463b5f77c2e499de (opens in a new tab)
- github.com/OpenMage/magento-lts/commit/e97e257b8f8d74d2e52dbf28caa211c262ff26be (opens in a new tab)
- vulncheck.com/advisories/openmage-magento-lts-before-20.18.2-stored-xss-via-admin-dataflow-tax-oauth-paypal-fields (opens in a new tab)