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CVE Record

CVE-2021-47750: YouPHPTube <= 7.8 - Cross-Site Scripting

YouPHPTube <= 7.8 contains a cross-site scripting vulnerability that allows attackers to inject malicious scripts through the redirectUri parameter in the signup page. Attackers can craft special signup URLs with embedded script tags to execute arbitrary JavaScript in victims' browsers when they access the signup page.

MediumCVSS 6.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-47750 is a browser-based cross-site scripting issue in YouPHPTube up to 7.8. A malicious signup link could run attacker-controlled JavaScript in a user’s browser. Business impact is mainly account/session risk and trust damage, not server takeover based on the provided sources.

Executive priority

Treat as a moderate-priority web application issue. It is not described as server compromise, but public signup pages can expose users to account theft or impersonation risk if left unremediated.

Technical view

The vulnerability is CWE-79 XSS in the signup page’s redirectUri parameter. It is network-reachable, requires user interaction, needs no privileges, and has CVSS 3.1 score 6.1. The source bundle identifies public exploit publication, but does not show confirmed active exploitation or a named patched release.

Likely exposure

Exposure is likely limited to legacy internet-facing YouPHPTube deployments at or below version 7.8, especially where public signup remains enabled. Organizations not running YouPHPTube are not affected based on the provided sources.

Exploitation context

An attacker would need to entice a victim to open a crafted signup URL. ExploitDB is cited as having an exploit, but the CVE is not listed as KEV and the bundle provides no evidence of active exploitation in the wild.

Researcher notes

Evidence supports reflected XSS via redirectUri on the signup page, with public exploit reference. The affected-version data is sparse, and the bundle does not name a fixed version, patch commit, or active exploitation source.

Mitigation direction

  • Identify whether any YouPHPTube deployments exist and their versions.
  • Check vendor or maintainer guidance for supported remediation or upgrade paths.
  • Disable or restrict public signup if it is not required.
  • Ensure redirect parameters are safely validated and encoded before rendering.
  • Consider retiring or isolating unsupported legacy deployments.

Validation and detection

  • Inventory public web assets for YouPHPTube instances.
  • Confirm whether any identified instance is version 7.8 or older.
  • Review signup page handling of the redirectUri parameter.
  • Check logs for unusual signup URLs targeting redirectUri.
  • Verify remediation against vendor guidance before closing the issue.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · medium confidence lookup

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.

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cve · low confidence lookup

CVE-2021-47750 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Official CVE source material

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.

2CVSS vectors
3Timeline events
1ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: pocAutomatable: noTechnical Impact: partial

CVSS vector scores

2 official scores

We 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.

ScoreVersionSeverityVectorExploitImpactSource
6.1CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7VulnCheck
5.1CVSS 4.0MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N——VulnCheck

Vulnerability scoring details

Base CVSS 4.0 score

5.1Medium
CVSS 4.0 vector shape for CVE-2021-47750Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
YouPHPTubeYouPHPTube0Listed
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.