Security readout for executives and security teams
Plain-English summary
CVE-2026-24476 affects Shaarli, a personal bookmarking service. Before version 0.16.0, a malicious suggested tag can inject arbitrary HTML and potentially run stored cross-site scripting in a user’s browser. Business risk is mainly account/session abuse or content manipulation within affected Shaarli instances.
Executive priority
Treat as a routine but timely update for any Shaarli deployment. Prioritize faster if Shaarli is shared among multiple users, exposed to untrusted administrators, or used to store sensitive links.
Technical view
Shaarli versions before 0.16.0 mishandle a crafted tag beginning with a double quote, prematurely ending an input element on the start page. This permits arbitrary HTML injection and possible stored XSS. The issue is classified as CWE-79 and fixed in Shaarli 0.16.0.
Likely exposure
Exposure is limited to organizations running Shaarli versions earlier than 0.16.0. The CVSS vector indicates high privileges are required and user interaction is involved, reducing broad internet-scale risk but not eliminating internal abuse risk.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as KEV in the supplied bundle. Exploitation requires creating a malicious tag and depends on user interaction with the affected interface.
Researcher notes
The advisory and CVE record identify the vulnerable component, affected version range, CWE, and fixing release. Public evidence provided does not include proof of active exploitation, exploit availability, or additional affected products.
Mitigation direction
- Upgrade Shaarli to version 0.16.0 or later.
- Review the GitHub advisory for vendor guidance.
- Restrict Shaarli administrative or high-privilege access to trusted users.
- Monitor for suspicious tag content until upgraded.
Validation and detection
- Inventory Shaarli deployments and identify versions below 0.16.0.
- Confirm upgraded instances report Shaarli 0.16.0 or later.
- Review stored tags for unexpected HTML-like content.
- Check access logs for unusual tag-management activity.
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-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-2026-24476 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
- Medium
- CVSS
- 5.3 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA: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:4.0/AV:L/AC:H/AT:N/PR:H/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
5.3MediumVector: CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/shaarli/Shaarli/security/advisories/GHSA-g3xq-mj52-f8pgCVE reference · x_refsource_CONFIRM
- https://github.com/shaarli/Shaarli/commit/b854c789289c4b0dfbb7c1e5793bae7d8f94e063CVE 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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.