Security readout for executives and security teams
Plain-English summary
CVE-2021-25878 is a reflected cross-site scripting issue in AVideo/YouPHPTube 10.0 and earlier. A remote attacker could target an administrator and potentially steal session cookies or make actions happen as that administrator.
Executive priority
Prioritize remediation for any exposed legacy AVideo/YouPHPTube deployment used by administrators. Business urgency rises if the platform manages public media content or privileged workflows.
Technical view
The CVE describes multiple reflected XSS vulnerabilities through the videoName parameter. The source bundle does not provide CVSS, CWE mapping, patch version, or detailed affected CPEs beyond AVideo/YouPHPTube 10.0 and prior.
Likely exposure
Exposure is most likely where AVideo/YouPHPTube 10.0 or earlier is deployed, especially internet-facing sites with active administrator sessions. The bundle does not identify specific CPEs or hosted-service exposure.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not claim active exploitation. Reflected XSS typically requires a victim interaction path, but the stated impact includes administrator session theft or administrative actions.
Researcher notes
Evidence is limited to the CVE description and Synacktiv reference bundle. Do not assume exploit availability, a specific fixed version, or broader product impact without vendor confirmation.
Mitigation direction
- Identify any AVideo/YouPHPTube deployments and confirm whether version is 10.0 or earlier.
- Review vendor or project guidance for the fixed release or official workaround.
- Restrict administrator access to trusted networks until official guidance is applied.
- Require administrators to reauthenticate after remediation and review active sessions.
- Warn administrators not to open untrusted links while logged in.
Validation and detection
- Inventory public and internal systems for AVideo or YouPHPTube installations.
- Confirm application version and compare it with the 10.0-and-prior affected range.
- Review web logs for suspicious requests involving the videoName parameter.
- Verify remediation against vendor guidance once an official fix or workaround is identified.
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-2021-25878 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.