Security readout for executives and security teams
Plain-English summary
Adobe After Effects 25.6 and earlier can mishandle a malicious file, potentially allowing attacker-controlled code to run with the victim’s account permissions. A user must open the file, making phishing, shared-project, and downloaded-asset workflows the likely delivery paths. Compromise could expose or alter data accessible to that user.
Executive priority
Treat this as a high-priority workstation update, particularly for creative teams handling third-party assets. Required user interaction reduces immediate exposure compared with a remote, no-click flaw, but successful exploitation can fully compromise the user’s data and working environment.
Technical view
CVE-2026-21324 is a CWE-125 out-of-bounds read in After Effects file parsing. Reading beyond an allocated memory structure may lead to code execution in the current user context. CVSS 3.1 is 7.8: local attack vector, low complexity, no privileges, required user interaction, unchanged scope, and high confidentiality, integrity, and availability impacts.
Likely exposure
Workstations running After Effects 25.6 or earlier are the stated exposure, especially where users open externally supplied project or media files. The bundle’s structured version list is ambiguous and should not be treated as authoritative without checking Adobe’s advisory and installed build numbers.
Exploitation context
Exploitation requires a victim to open a crafted file. The supplied record is not listed in CISA KEV, and the provided sources do not establish active exploitation. Absence from KEV does not prove exploitation is not occurring.
Researcher notes
The source bundle describes 25.6 and earlier as affected, while its structured version entries include 25.6.4 and 26.0 with unclear semantics. Verify exact affected and fixed builds against Adobe APSB26-15. No exploit mechanics, proof of concept, or confirmed exploitation evidence is supplied.
Mitigation direction
- Review Adobe APSB26-15 and apply the vendor-designated security update to affected installations.
- Prioritize systems whose users routinely receive After Effects files from external or untrusted sources.
- Until updated, restrict opening unsolicited files and validate their source through a separate communication channel.
- Use least-privilege accounts to limit consequences of code execution in the current user context.
Validation and detection
- Inventory After Effects installations and record exact versions and build numbers.
- Compare each installed build with the affected and corrected versions stated in Adobe APSB26-15.
- Confirm the security update completed successfully through endpoint-management or application inventory records.
- Review endpoint alerts for suspicious activity following recently opened, externally sourced After Effects files.
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-125: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2026-21324 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
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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
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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9adobeVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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://helpx.adobe.com/security/products/after_effects/apsb26-15.htmlCVE reference, adobe · vendor-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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.