Security readout for executives and security teams
Plain-English summary
CVE-2026-25847 is a high-severity DOM-based cross-site scripting flaw in JetBrains PyCharm’s Jupyter viewer page before version 2025.3.2. A successful attack requires user interaction and could let attacker-controlled content run in the viewer context, risking data exposure or tampering.
Executive priority
Treat as a high-priority developer workstation update. The risk is not reported as actively exploited, but compromise of developer tools can expose sensitive code, notebooks, credentials, or project data.
Technical view
The CVE describes CWE-79 DOM-based XSS in PyCharm’s Jupyter viewer page. CVSS 3.1 is 8.2 with network attack vector, high complexity, no privileges required, user interaction required, changed scope, and high confidentiality and integrity impact.
Likely exposure
Organizations are likely exposed if developers use JetBrains PyCharm versions before 2025.3.2 and open or view Jupyter content in the affected viewer. The provided affected-version metadata is sparse, so validate directly against JetBrains guidance.
Exploitation context
No CISA KEV listing or provided source indicates active exploitation. Exploitation requires user interaction and is rated high complexity, which reduces likelihood but does not remove risk for developers handling untrusted notebooks or shared project files.
Researcher notes
Public details are limited to the CVE description, CVSS vector, CWE-79 classification, and JetBrains fixed-issues reference. The source bundle does not provide proof-of-concept details, exploit status, or granular affected build ranges beyond “before 2025.3.2.”
Mitigation direction
- Upgrade JetBrains PyCharm to version 2025.3.2 or later.
- Review JetBrains’ fixed issues page for any product-specific guidance.
- Limit opening untrusted Jupyter notebooks until patched.
- Prioritize patching developer workstations that handle external or shared notebook content.
Validation and detection
- Inventory installed JetBrains PyCharm versions across developer endpoints.
- Flag PyCharm installations older than 2025.3.2.
- Confirm whether teams use PyCharm’s Jupyter viewer functionality.
- Check JetBrains advisory pages for updated affected-version details.
- Document remediation status for all developer endpoints.
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-2026-25847 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
- 8.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L
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:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L1.66Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.2HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://www.jetbrains.com/privacy-security/issues-fixed/CVE reference
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.