CVE-2021-26833

Account-token disclosure via uncleared cache files

Published Apr 6, 2021 · Updated Aug 3, 2024

Cleartext storage in TimelyBills 1.7.0 and earlier on iOS and 1.21.115 and earlier on Android allows local users to obtain JWT tokens. The application's cache-clearing logic leaves signed, encoded account tokens in locally readable files instead of removing them. Exploitation requires local file access and exposes token-contained account data because JWT signing provides integrity, not encryption.

CVSS severity5.9
Medium
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext storage in TimelyBills 1.7.0 and earlier on iOS and 1.21.115 and earlier on Android allows local users to obtain JWT tokens. The application's cache-clearing logic leaves signed, encoded account tokens in locally readable files instead of removing them. Exploitation requires local file access and exposes token-contained account data because JWT signing provides integrity, not encryption.

The record

CVE
CVE-2021-26833
Published
Apr 6, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-459, T1552.001
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-459Incomplete Cleanup
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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