Security readout for executives and security teams
Plain-English summary
YouPHPTube versions up to 7.8 can let an unauthenticated internet user read files through a language-selection parameter. The main business risk is exposure of application source or local sensitive files, depending on deployment. Public exploit material exists, but the provided sources do not show confirmed active exploitation.
Executive priority
Prioritize internet-facing YouPHPTube systems for immediate review. This is a high-severity legacy web application flaw with public exploit information and no authentication barrier. If the product is no longer business-critical, retirement or isolation may be faster and safer than extended remediation work.
Technical view
CVE-2021-47749 is a CWE-22 path traversal/local file inclusion issue in locale/function.php. An unauthenticated GET request can manipulate the lang parameter with traversal sequences to include and view PHP files outside the intended locale directory. CVSS 4.0 is 8.7 high with network attack vector and no privileges or user interaction required.
Likely exposure
Exposure is most likely where legacy YouPHPTube installations up to version 7.8 remain reachable over HTTP or HTTPS. The supplied affected CPE data is incomplete, so teams should verify by product name, installed version, code path, and external exposure rather than relying on scanner CPE matching alone.
Exploitation context
ExploitDB is cited, so public exploit information exists. However, KEV is false and the supplied sources do not state active exploitation in the wild. Treat internet-facing instances as urgent because exploitation is unauthenticated, low complexity, and may disclose high-value local application data.
Researcher notes
The provided bundle names YouPHPTube <=7.8 and describes lang parameter traversal in locale/function.php. It does not provide a confirmed patched version, vendor advisory, CPE mapping, or active exploitation evidence. Validation should stay defensive: version confirmation, code-path review, exposure mapping, and log analysis.
Mitigation direction
- Identify and inventory any YouPHPTube installations, especially versions up to 7.8.
- Check vendor or project guidance for a fixed release, migration path, or supported remediation.
- Remove public access to affected instances until remediation is confirmed.
- Restrict access with authentication, network controls, or allowlists where retirement is not immediate.
- Review exposed files and secrets if exploitation is suspected.
Validation and detection
- Confirm whether the host runs YouPHPTube and determine its installed version.
- Review web routes for reachable locale/function.php behavior.
- Search web logs for suspicious lang parameter traversal patterns.
- Check whether scanners flag CVE-2021-47749 or YouPHPTube directory traversal.
- Verify compensating controls block unauthenticated access to the affected path.
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-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-47749 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
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/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.
SSVC decision data
CVSS vector scores
2 official scoresWe 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:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N1.83.6VulnCheckVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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
- ExploitDB-51101CVE reference, VulnCheck · exploit
- Archived YouPHPTube HomepageCVE reference, VulnCheck · product
- VulnCheck Advisory: YouPHPTube <= 7.8 - Directory TraversalCVE reference, VulnCheck · 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.