Security readout for executives and security teams
Plain-English summary
Piranha CMS had a site-wide CSRF weakness in its management system. If an administrator is tricked into visiting attacker-controlled content while logged in, actions such as deleting users or roles, editing posts, or deleting media folders could be triggered when object IDs are known.
Executive priority
Treat this as high priority for any active PiranhaCMS site with administrative users. The main business risk is unauthorized content or account administration changes, including deletion, after social engineering of a logged-in administrator.
Technical view
CVE-2021-25976 is CWE-352 affecting PiranhaCMS/Piranha versions 4.0.0-alpha1 through 9.2.0. The CVSS 3.1 score is 8.1, reflecting network reachability, low attack complexity, required user interaction, and high integrity and availability impact.
Likely exposure
Organizations are most exposed if they run affected PiranhaCMS versions and administrators access the management interface in normal browser sessions. Risk increases when the management system is reachable from untrusted networks or object IDs are predictable or discoverable.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Exploitation requires user interaction and an authenticated management user’s browser, but the impact can be serious because administrative state-changing actions are in scope.
Researcher notes
The record names broad management actions and requires a known ID, but the bundle does not provide endpoint-level detail. Avoid assuming exploit availability or exact fixed release beyond the referenced upstream commit and affected version range.
Mitigation direction
- Identify all PiranhaCMS deployments and versions.
- Prioritize upgrade or remediation for versions 4.0.0-alpha1 through 9.2.0.
- Review PiranhaCMS vendor guidance and the referenced fix commit.
- Restrict management access to trusted networks where feasible.
- Require administrators to use separate sessions for CMS administration.
Validation and detection
- Confirm deployed PiranhaCMS version is outside the affected range or includes the referenced fix.
- Review management routes for anti-CSRF protections on state-changing actions.
- Check whether user, role, post, and media actions require valid CSRF tokens.
- Verify the management interface is not unnecessarily exposed to the internet.
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-352: 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-2021-25976 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
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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:N/UI:R/S:U/C:N/I:H/A:H2.85.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/PiranhaCMS/piranha.core/commit/e42abacdd0dd880ce9cf6607efcc24646ac82edaCVE reference · x_refsource_MISC
- https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25976CVE reference · x_refsource_MISC
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.
Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.