Security readout for executives and security teams
Plain-English summary
CVE-2026-27743 is a critical unauthenticated SQL injection in the SPIP referer_spam plugin before 1.3.0. An internet-facing site using the vulnerable plugin could allow a remote attacker to read, change, or disrupt database data without logging in. No cited source confirms active exploitation or KEV listing.
Executive priority
Treat as urgent for any public SPIP site using referer_spam. The flaw is critical because it needs no login and can affect database confidentiality, integrity, and availability. Prioritize inventory and upgrade or disablement ahead of routine maintenance.
Technical view
The referer_spam_ajouter and referer_spam_supprimer action handlers read a GET url parameter and place it directly into SQL LIKE clauses without validation or parameterization. The endpoints also lack authorization checks and SPIP action protections such as securiser_action(). The CVSS v3.1 score is 9.8, with network, low-complexity, no-privilege, no-user-interaction characteristics.
Likely exposure
Exposure is most likely on public SPIP sites with the referer_spam plugin installed at versions up to 1.2.1 or otherwise before 1.3.0. Systems not using this plugin are not indicated as affected by the provided sources.
Exploitation context
The vulnerability is remotely reachable and unauthenticated according to the CVE description and VulnCheck advisory. A technical blog is tagged as including exploit information, but Glexia is not reproducing it. There is no KEV entry and no cited confirmation of active exploitation.
Researcher notes
The CVE record states affected plugin versions are prior to 1.3.0, while the structured affected entry is sparse. Validate against the plugin page and patch commit. Do not assume broader SPIP core exposure from this CVE without vendor confirmation.
Mitigation direction
- Inventory SPIP sites for the referer_spam plugin and installed version.
- Upgrade referer_spam to version 1.3.0 or later where available.
- Review the referenced patch commit and vendor guidance before backporting changes.
- If immediate upgrade is impossible, disable the plugin until remediated.
Validation and detection
- Confirm whether referer_spam is installed on each SPIP instance.
- Verify installed versions are 1.3.0 or later.
- Check that the patch corresponding to commit 33682df is present.
- Review web and database logs for suspicious unauthenticated requests to referer_spam actions.
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-89: Database access and collection lookup
Injection into data stores can inform collection, data access, and exfiltration detection reviews. 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 lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-27743 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://chocapikk.com/posts/2026/spip-plugins-vulnerabilities/CVE reference · technical-description, exploit
- https://blog.spip.net/Mise-a-jour-de-securite-sortie-de-SPIP-4-4-10.htmlCVE reference · vendor-advisory
- https://plugins.spip.net/referer_spam.htmlCVE reference · product
- https://git.spip.net/spip-contrib-extensions/referer_spam/-/commit/33682df73cd5f7e9c72d8c4d5088611fa2441683CVE reference · patch
- https://www.vulncheck.com/advisories/spip-referer-spam-unauthenticated-sql-injectionCVE reference · third-party-advisory
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 used in an SQL Command ('SQL Injection')
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.