diff --git a/mass-update-cache.py b/mass-update-cache.py
new file mode 100644
index 000000000000..afce003f93ad
--- /dev/null
+++ b/mass-update-cache.py
@@ -0,0 +1,135 @@
+#!/usr/bin/env python3
+import re
+import sys
+from argparse import ArgumentParser
+from os.path import dirname, abspath, join, exists
+from socket import setdefaulttimeout
+
+import github
+
+from cms_static import VALID_CMS_SW_REPOS_FOR_TESTS
+from github_utils import api_rate_limits, get_gh_token, set_gh_user
+from process_pr import (
+    ISSUE_SEEN_MSG,
+    CMSBOT_TECHNICAL_MSG,
+    REGEX_COMMITS_CACHE,
+    loads_maybe_decompress,
+)
+
+# Copied from gh-teams.py
+CMS_ORGANIZATIONS = ["cms-data", "cms-externals", "cms-sw"]
+
+setdefaulttimeout(120)
+
+SCRIPT_DIR = dirname(abspath(sys.argv[0]))
+
+
+# Notice: can't use `process_pr.read_bot_cache` since it modifies bot cache before returning.
+# Another solution is to add a flag to `read_bot_cache` to load cache without adding missing keys
+def load_bot_cache_local(comment_msg):
+    seen_commits_match = REGEX_COMMITS_CACHE.search(comment_msg)
+    if seen_commits_match:
+        print("Loading bot cache")
+        res = loads_maybe_decompress(seen_commits_match[1])
+        return res
+    return {}
+
+
+def process_repo(gh, repo, args):
+    res = []
+    print("Using repository", repo.full_name)
+    repo_name = repo.full_name
+    repo_dir = join(SCRIPT_DIR, "repos", repo_name.replace("-", "_"))
+    if exists(repo_dir):
+        sys.path.insert(0, repo_dir)
+    import repo_config
+
+    cmsbuild_user = repo_config.CMSBUILD_USER
+    set_gh_user(cmsbuild_user)
+
+    if not getattr(repo_config, "RUN_DEFAULT_CMS_BOT", True):
+        sys.exit(0)
+
+    for issue in repo.get_pulls(sort="updated", direction="desc", state="all"):
+        print("  Processing PR#{0}: {1}".format(issue.number, issue.title))
+        api_rate_limits(gh)
+        bot_cache = None
+        for comment in issue.get_issue_comments():
+            if comment.user.login.encode("ascii", "ignore").decode() != cmsbuild_user:
+                continue
+            comment_msg = comment.body.encode("ascii", "ignore").decode() if comment.body else ""
+            first_line = "".join(
+                [line.strip() for line in comment_msg.split("\n") if line.strip()][0:1]
+            )
+            if re.match(CMSBOT_TECHNICAL_MSG, first_line):
+                bot_cache = load_bot_cache_local(comment_msg)
+                if bot_cache:
+                    print("    Read bot cache from already seen comment:", comment)
+                    break
+            elif re.match(ISSUE_SEEN_MSG, first_line):
+                bot_cache = load_bot_cache_local(comment_msg)
+                if bot_cache:
+                    print("    Read bot cache from technical comment:", comment)
+                    break
+        if bot_cache and ("commits" not in bot_cache):
+            print("    PR needs to be reprocessed")
+            # Notice: can't "just" call process_pr, since it modifies global variables :(
+            # process_pr(repo_config, gh, repo, issue, args.dryrun, cmsbuild_user=None, force=False)
+            res.append(
+                "python3 process-pull-request.py --force "
+                + (" --dry-run " if args.dryrun else " ")
+                + "--repository "
+                + repo.full_name
+                + " "
+                + str(issue.number)
+            )
+
+        if not bot_cache:
+            print("No bot cache, stopping here")
+            break
+
+    return res
+
+
+def main():
+    parser = ArgumentParser()
+    parser.add_argument("-n", "--dry-run", dest="dryrun", action="store_true")
+    args = parser.parse_args()
+
+    gh = github.Github(login_or_token=get_gh_token())
+    api_rate_limits(gh)
+    cnt = 0
+
+    all_repos = []
+
+    for name in VALID_CMS_SW_REPOS_FOR_TESTS:
+        all_repos.append("cms-sw/" + name)
+
+    for org in CMS_ORGANIZATIONS:
+        if org == "cms-sw":
+            continue
+
+        all_repos.extend(r.full_name for r in gh.get_organization(org).get_repos())
+
+    with open("runme.sh", "w") as f:
+        for repo_name in all_repos:
+            print("Getting repo", repo_name)
+            try:
+                repo = gh.get_repo(repo_name)
+            except github.UnknownObjectException:
+                continue
+            res = process_repo(gh, repo, args)
+            print("Writing {0} line(s) to script".format(len(res)))
+            for line in res:
+                print(line, file=f)
+
+            cnt += len(res)
+
+    if args.dryrun:
+        print("Would update {0} PRs/Issues".format(cnt))
+    else:
+        print("Updated {0} PRs/Issues".format(cnt))
+
+
+if __name__ == "__main__":
+    main()