Security readout for executives and security teams
Plain-English summary
An authenticated October CMS backend user with file upload rights could upload a malicious SVG. If someone later opened that SVG directly under the site domain, browser script could run. The sources describe limited impact because SVGs were not displayed inline in the backend.
Executive priority
Treat as a low-priority remediation unless vulnerable October CMS instances allow many backend uploaders or host sensitive authenticated workflows on the same domain. Patch during normal maintenance and tighten upload permissions.
Technical view
CVE-2020-15249 is a stored XSS issue in October CMS versions 1.0.319 through before 1.0.469. Unsanitized SVG uploads could contain browser-executed script when visited directly. CVSS 3.1 score is 2.8, with low privileges and user interaction required. Patched in Build 469 and v1.1.0.
Likely exposure
Exposure is limited to self-hosted October CMS deployments running >=1.0.319 and <1.0.469 where backend users can upload files, especially where uploaded media paths are reachable under the website domain.
Exploitation context
The bundle does not cite active exploitation, and CISA KEV is false. Abuse requires an authenticated backend user with upload access plus a victim directly visiting the uploaded SVG path. The backend reportedly displays SVGs only as image resources, reducing automatic execution paths.
Researcher notes
Focus validation on version, upload permissions, and public reachability of uploaded SVG media. The provided sources do not support unauthenticated exploitation, automatic backend execution, data theft, or remote code execution claims.
Mitigation direction
- Upgrade October CMS to Build 469, v1.0.469, v1.1.0, or later.
- Restrict backend file upload privileges to trusted users only.
- Review uploaded SVG files in media storage and remove suspicious or unneeded files.
- Check October CMS vendor guidance for any additional supported hardening.
Validation and detection
- Confirm the running October CMS version is not between 1.0.319 and 1.0.468.
- List backend users or roles with file upload access.
- Review media storage for SVG files uploaded during the vulnerable period.
- Confirm upgraded instances sanitize or prevent unsafe SVG upload behavior.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-15249 mapping review
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Open ATT&CK lookup- Severity
- Low
- CVSS
- 2.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N1.31.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
2.8LowVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/octobercms/library/commit/80aab47f044a2660aa352450f55137598f362aa4CVE reference · x_refsource_MISC
- https://github.com/octobercms/october/security/advisories/GHSA-fx3v-553x-3c4qCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation
Improper Neutralization of Input During Web Page Generation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.