Security readout for executives and security teams
Plain-English summary
CVE-2021-32649 lets a low-privileged backend user with page management rights turn October CMS template editing into server-side code execution. For a self-hosted CMS, that can mean full compromise of the website and underlying application data. The issue is fixed in Build 473 and v1.1.6.
Executive priority
Treat this as a high-priority CMS remediation if October CMS is used. It is not described as unauthenticated or actively exploited in the provided sources, but successful abuse can lead to full website compromise by any attacker who obtains the relevant backend privileges.
Technical view
October CMS before 1.0.473 and versions 1.1.0 through before 1.1.6 allowed backend users with create, modify, and delete website page privileges to execute PHP through specially crafted Twig template markup. The CVSS 3.1 score is 8.8, with network access, low complexity, low privileges, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to self-hosted October CMS deployments running affected versions where an attacker can authenticate to the backend and has website page management privileges. Public internet exposure increases business risk, but the source bundle does not state unauthenticated exploitation.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as KEV in the bundle. Exploitation requires backend access with page creation, modification, and deletion permissions, then abuse of Twig template markup to reach PHP execution.
Researcher notes
Focus validation on version/build confirmation and authorization boundaries around backend page editing. The weakness is classified as CWE-74 and tied to Twig template markup reaching PHP execution. Avoid assuming other October CMS components or plugins are affected unless vendor sources confirm them.
Mitigation direction
- Upgrade October CMS to Build 473, v1.0.473, v1.1.6, or later supported releases.
- If upgrading is delayed, apply the vendor patch manually as advised by the advisory.
- Restrict backend page management permissions to trusted administrators only.
- Review backend accounts and remove unnecessary page create, modify, or delete privileges.
- Monitor October CMS vendor guidance for any additional supported remediation details.
Validation and detection
- Inventory October CMS installations and record exact build or version numbers.
- Confirm no production instance is below 1.0.473 or between 1.1.0 and 1.1.5.
- Verify the vendor patch commit or equivalent update is present where upgrades were not performed.
- Audit backend users with page management privileges for unnecessary access.
- Review recent page template changes for unauthorized or unexpected modifications.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-74: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-32649 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/octobercms/october/commit/167b592eed291ae1563c8fcc5b9b34a03a300f26CVE reference · x_refsource_MISC
- https://github.com/octobercms/october/security/advisories/GHSA-wv23-pfj7-2mjjCVE 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 Special Elements in Output Used by a Downstream Component ('Injection')
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.