Security readout for executives and security teams
Plain-English summary
This CVE is a Pega Infinity configuration issue affecting versions 7.4.0 through before 8.5.3. If the Pega Chat Access Group portal is misconfigured, sensitive data could be exposed. The CVSS score is medium, but the impact ratings for confidentiality, integrity, and availability are high once prerequisites are met.
Executive priority
Treat this as a moderate-priority exposure review for Pega environments, especially where Pega handles sensitive customer, citizen, or operational records. Prioritize confirmation of affected versions and vendor-guided remediation over emergency response unless local evidence suggests misuse.
Technical view
CVE-2021-27653 is classified under CWE-284 for improper access control. The CVSS vector shows network access, high attack complexity, high privileges required, no user interaction, unchanged scope, and high C/I/A impact. The vulnerable condition is a misconfigured Pega Chat Access Group portal in affected Pega Infinity versions.
Likely exposure
Exposure is most likely in organizations running Pega Infinity >=7.4.0 and <8.5.3 with Pega Chat Access Group portal configuration present. The source bundle does not establish exposure for other Pega products or newer versions.
Exploitation context
The CVE is not listed as CISA KEV in the provided bundle. No cited source in the bundle proves current active exploitation. One referenced public write-up discusses data exposure involving OAuth tokens and user records, but the bundle does not support claiming widespread exploitation.
Researcher notes
The public CVE data is sparse and describes a misconfiguration rather than a detailed code flaw. Avoid assuming exploitability beyond the CVSS prerequisites. Validation should focus on version range, portal presence, access-control configuration, and evidence of unintended data access.
Mitigation direction
- Upgrade Pega Infinity to a version outside the affected range, if supported by Pega guidance.
- Review the Pega Security Advisory B21 for vendor-specific remediation details.
- Audit Pega Chat Access Group portal configuration against approved access-control expectations.
- Restrict administrative and high-privilege access to trusted operators only.
- Monitor for unusual access to chat portal data or related records.
Validation and detection
- Inventory Pega Infinity versions and identify any deployments before 8.5.3.
- Confirm whether the Pega Chat Access Group portal is enabled or configured.
- Review access groups, roles, and privileges tied to the chat portal.
- Check logs for unexpected high-privilege access to chat-related data.
- Document remediation status against Pega advisory B21.
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-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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-2021-27653 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
- Medium
- CVSS
- 6.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/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.
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:H/UI:N/S:U/C:H/I:H/A:H0.75.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.6MediumVector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://collaborate.pega.com/discussion/pega-security-advisory-%E2%80%93-b21CVE reference · x_refsource_MISC
- https://robertwillishacking.com/census-vulnerability-exposes-10k-oauth-tokens-thousands-of-user-records/CVE reference · x_refsource_MISC
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 Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.