Security readout for executives and security teams
Plain-English summary
AVideo/YouPHPTube 10.0 and earlier contains reflected cross-site scripting issues. A remote attacker could use the vulnerable u parameter to run script in an administrator's browser, potentially stealing administrator session cookies or causing administrator-level actions.
Executive priority
Prioritize remediation for public-facing deployments with active administrators. The business risk is account/session compromise leading to unauthorized administrative actions, but there is no supplied evidence of active exploitation.
Technical view
The CVE describes multiple reflected XSS vulnerabilities in AVideo/YouPHPTube through the u parameter. The public record does not provide CVSS, CWE, precise endpoint coverage, or a named fixed version in the supplied sources.
Likely exposure
Organizations running internet-accessible AVideo/YouPHPTube 10.0 or earlier are the primary concern, especially where administrators use the application from normal browsing environments.
Exploitation context
The supplied sources do not show CISA KEV listing or confirmed active exploitation. The described impact is serious because reflected XSS can target administrator sessions, but exploit prevalence is not established here.
Researcher notes
Evidence is limited to CVE metadata and the Synacktiv reference. The supplied bundle does not include CVSS, CWE mapping, affected CPEs, exploit maturity, or a confirmed patched version, so validation should stay source-grounded.
Mitigation direction
- Identify all AVideo/YouPHPTube deployments and their versions.
- Check vendor or project guidance for a fixed release before changing production.
- Upgrade if vendor guidance identifies a patched version beyond 10.0.
- Limit administrator access to trusted networks where feasible.
- Review cookie and browser security controls for administrative sessions.
Validation and detection
- Confirm whether any deployment runs AVideo/YouPHPTube 10.0 or earlier.
- Review application logs for unusual requests involving the u parameter.
- Check vulnerability scanner results for reflected XSS findings on affected routes.
- Verify administrative users are not routinely browsing untrusted links while authenticated.
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.
CVE-2021-25876 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://synacktiv.com/CVE reference, mitre
- https://www.synacktiv.com/sites/default/files/2021-01/YouPHPTube_Multiple_Vulnerabilities.pdfCVE reference, mitre
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.